Exsolution in clinoamphiboles
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Abstract
Ten amphibole specimens from a variety of metamorphic rocks such as talc schists, eclogites, and metamorphosed iron formations contain lamellae of a second amphibole oriented parallel to (1̅01) or (100), or both, of the host. Tremolites, actinolites, and hornblendes commonly have lamellae of a calcium-poor clinoamphibole with P21/m space-group symmetry, or lamellae of cummingtonite with C2/m space-group symmetry. Likewise cummingtonites and P21/m clinoamphiboles commonly contain lamellae of calcium-rich C2/m amphiboles such as tremolite. Results of x-ray diffraction, electron-probe, and microscope studies indicate that most lamellae result from unmixing of a homogeneous amphibole. The P21/m clinoamphibole is analogous to the clinopyroxene pigeonite in agreement with the results of M. G. Bown.
Suggested Citation
Ross, M., Papike, J.J., and Weiblen, P., 1968, Exsolution in clinoamphiboles: Science, v. 159, no. 3819, p. 1099-1102, https://doi.org/10.1126/science.159.3819.1099.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Exsolution in clinoamphiboles |
| Series title | Science |
| DOI | 10.1126/science.159.3819.1099 |
| Volume | 159 |
| Issue | 3819 |
| Year Published | 1968 |
| Language | English |
| Publisher | American Association for the Advancement of Science. |
| Description | 4 p. |
| First page | 1099 |
| Last page | 1102 |